45# Steel Billet - Hot Rolled Carbon Steel Billets for Forging & Rolling

45# steel billet represents a medium carbon structural steel semi-finished product extensively employed in manufacturing industries requiring superior mechanical strength and excellent machinability. This hot-rolled carbon steel billet serves as the fundamental raw material for producing forged components, rolled sections, and precision-machined parts across automotive, machinery, and construction sectors. With its optimal carbon content of 0.42-0.50%, 45# steel billet delivers exceptional tensile properties while maintaining cost-effective pricing for high-volume production requirements.

What is 45# Steel Billet?

45# steel billet is a hot-rolled semi-finished carbon steel product manufactured to rectangular or square cross-sections, conforming to GB/T 699-2015 standard specifications. This medium carbon steel grade contains 0.42-0.50% carbon content, providing tensile strength of 600 MPa minimum and yield strength of 355 MPa, making it the preferred choice for applications demanding robust mechanical properties combined with superior forgeability and weldability characteristics.

45# Steel Billet Technical Specifications

Our 45# steel billets are manufactured according to GB/T 699-2015 Section 5.2 with carbon content of 0.42-0.50%, manganese 0.50-0.80%, silicon 0.17-0.37%, phosphorus maximum 0.035%, and sulfur maximum 0.035%. Standard dimensions range from 100×100mm to 300×300mm in cross-section, with lengths extending from 6 to 12 meters. The material exhibits Brinell hardness of 170-217 HB and impact toughness exceeding 39 J at room temperature per GB/T 229-2020 testing protocols.

Manufacturing Process & Quality Control

45# steel billets undergo continuous casting or ingot casting processes followed by hot rolling at temperatures between 1150-1200°C. Our mill employs real-time spectroscopic analysis ensuring chemical composition accuracy within ±0.02% tolerance. Each production batch receives ultrasonic testing per GB/T 2970-2016 to detect internal discontinuities, with acceptance criteria requiring zero defects exceeding 2mm equivalent flat-bottom hole diameter. Surface quality conforms to GB/T 3077-2015 Class C requirements, limiting decarburization depth to 0.5mm maximum.

Applications & Industry Usage

This carbon steel billet finds extensive application in forging crankshafts, connecting rods, gears, and heavy-duty axles for automotive and agricultural machinery. The construction equipment sector utilizes 45# billets for manufacturing excavator pins, hydraulic cylinder rods, and structural components requiring 600-750 MPa tensile strength. Machine tool manufacturers employ this grade for producing spindles, guide rails, and precision shafts where superior machinability and dimensional stability prove essential for achieving tight tolerances of ±0.05mm.

Heat Treatment Capabilities

45# steel billet responds excellently to quenching and tempering heat treatment, achieving hardness values of 45-50 HRC after oil quenching from 840-860°C followed by tempering at 550-650°C. Normalizing treatment at 850-870°C refines grain structure to ASTM grain size 6-8, enhancing impact toughness by 25-30% compared to as-rolled condition. Induction hardening processes can selectively harden surface layers to 55-60 HRC depth of 3-8mm while maintaining core toughness for applications requiring wear-resistant surfaces with shock-absorbing cores.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard minimum order quantity for 45# steel billet is 25 metric tons per specification. For customized dimensions outside our regular production range of 100-300mm square sections, the MOQ increases to 100 metric tons to justify special rolling schedules. We offer flexible packaging options including bundled, loose, or containerized shipments to optimize transportation costs for both domestic and international deliveries.

Do you provide material test certificates?

Every shipment includes EN 10204 Type 3.1 mill test certificates documenting chemical composition analysis, tensile testing results per GB/T 228.1-2010, impact testing data, and ultrasonic inspection reports. Certificates bear third-party witness signatures from SGS, BV, or TÜV inspectors upon request. We maintain complete traceability through heat number identification stamped on each billet, linking to original ladle analysis and mechanical property test records archived for minimum 15 years.

What is the typical delivery time?

Standard dimension 45# steel billets from our regular inventory ship within 7-10 working days after payment confirmation. Custom-rolled specifications require 25-35 days production lead time depending on mill scheduling and order quantity. We coordinate with freight forwarders to arrange container loading at Tianjin or Shanghai ports, with typical sea freight transit times of 18-25 days to major European ports and 12-18 days to Southeast Asian destinations.

Can you cut to custom sizes?

Our precision sawing facility accommodates custom length cutting with tolerance of ±5mm for lengths 1-12 meters. We offer additional services including chamfering, center drilling, and rough machining to customer-supplied drawings with dimensional accuracy of ±0.2mm. Surface conditioning treatments such as shot blasting, pickling, and phosphating are available to prepare billets for direct forging operations or long-term storage requiring corrosion protection up to 12 months indoor conditions.

Get a Competitive Quote for 45# Steel Billet

Request your factory-direct pricing for premium grade 45# steel billets with complete mill certifications and customized processing services. Our technical sales team provides expert consultation on material selection, heat treatment recommendations, and logistics optimization to reduce your total landed costs. Contact us today with your specification requirements, target delivery schedule, and annual volume projections to receive a comprehensive quotation within 24 hours including chemical composition guarantees and mechanical property commitments.